Ready to take the plunge on a new iMac but looking for some configuration advice. I am replacing a Windows system that drives (4) 19" 4:3 monitors. I am not a power user from a standpoint of the programs that I run (Outlook, Word, Excel, Acrobat and Firefox) but I do like lots of screen real estate and like to have lots of windows open at once. I intend to run at least 1, if not 2, additional monitors off of this 27" iMac. I intend to get 8 GB of RAM regardless. I also hope to hook up a TV tuner and my DirectTV box. That said, which one of these systems will handle my load or the better question is can either of the first 2, the less expensive configurations, do it? Configuration Options: 1) 2.7 i5, 8 GB, 512 MB Video 2) 3.1 i5, 8 GB, 1 GB Video 3) 3.1 i5, 8 GB, 2 GB Video 4) 3.4 i7, 8 GB, 1 GB Video 5) 3.4 i7, 8 GB, 2 GB Video Money is tight but I don't want to make a mistake.